Method for resource allocation, method for channel state information transmission, base station and user equipment

ABSTRACT

A method for resource allocation, method for channel state information transmission, base station and user equipment. Wherein the method for resource allocation includes: determining, by a base station, that it is necessary for a UE to report aperiodic CSI of relevant downlink CCs; and allocating, by the base station, corresponding resources to the UE according to the number of the relevant downlink CCs. The base station allocates corresponding resources to the UE in accordance with the number of relevant downlink CCs, resource allocation is flexible, and the transmission of UCI in case of multiple carriers is supported.

CROSS-REFERENCE TO RELATED APPLICATION

The present application is a continuation application of the U.S. patentapplication Ser. No. 13/922,690, filed Jun. 20, 2013, now pending, whichis a continuation of PCT/CN2010/080111, filed Dec. 22, 2010, the entirecontents of each are wholly incorporated by reference.

TECHNICAL FIELD

The present invention relates to the field of wireless communication,and in particular to a method for resource allocation, method forchannel state information transmission, base station and user equipment.

BACKGROUND ART

In a long-term evolution (LTE) system, a user equipment (UE) obtainschannel state information (CSI) in downlink by measuring a downlinkreference signal, and reports to a base station via an uplink, the CSIcomprising a channel quality indicator (CQI) of the downlink, and alsoinformation of precoding matrix indicator (PMI) and rank indication (RI)for some downlink transmission mode. The above CSI, as well as ACK/NACKinformation and scheduling request (SR), are collectively referred to asuplink control information (UCI). The UCI may contain one piece of theabove information only, or more pieces of the above information. Thebase station selects typical modulation and coding scheme, multi-antennaprocessing and hybrid automatic repeat request (HARM) on the basis ofthe UCI reported by the UE, and adaptively adjusts data transmissiondynamically.

Currently, the CSI in the UCI may be reported periodically andaperiodically. Here, for the sake of convenience, the CSI reportedperiodically is referred to as periodic CSI, and the CSI reportedaperiodically is referred to as aperiodic CSI. Generally, UCI containingperiodic CSI is transmitted on a physical uplink control channel(PUCCH), and UCI containing aperiodic CSI is transmitted on a physicaluplink shared channel (PUSCH), which may be multiplexed with uplink data(such as UL-SCH (uplink shared channel) data), and may also betransmitted separately on a PUSCH when there is no uplink data.

When it is necessary for a UE to report aperiodic CSI, the followingmanner may be used: when a base station requires a user equipment toreport aperiodic CSI, the base station transmits downlink controlinformation (DCI) to the UE, so as to instruct the UE to reportaperiodic CSI and allocate corresponding PUSCH resources used forreporting the aperiodic CSI to the UE; when the UE receives the DCI, itreports aperiodic CSI by using the resources instructed in the DCI, andhas the CSI contained in the UCI and transmitted to the base station viathe PUSCH.

In an LTE system, one bit in a DCI format 0 is used to trigger a UE toreport aperiodic CSI. In an advanced long-term evolution (LTE-A) system,since the system may support the transmission of multiple componentcarriers (CCs), and may support at most five CCs at present, so, inorder to instruct a UE to report UCIs of multiple downlink CCs flexibly,two bits in DCI format 0/DCI format 4 are used to trigger a UE to reportaperiodic CSI, and the UE is indicated to report the indices and thenumber of the corresponding downlink CCs.

In the implementation of certain embodiments, this applicant found thatfollowing defects exist in the prior art:

In an LTE system, each UE is configured with only one pair of uplink anddownlink CCs. When the UE transmits UCI containing aperiodic CSI on aPUSCH with no data, a base station allocates four resource blocks (RBs)to the UE at most, and ensures the correct receiving of the UCIcontaining aperiodic CSI by using a reasonable channel encoding rate.

However, in an LTE-A system, with the number of CCs increases, thelength of the UCI also increases. If the base station allocates four RBsto the UE at most, the resources allocated by the base station to the UEfor transmitting the UCI containing aperiodic CSI are possiblyinsufficient. Hence, the correct receiving of the UCI by the basestation cannot be ensured, and limitation of the scheduling of the datatransmission by the base station is increased. No solution has beenfound till now to overcome the above defects.

It should be noted that the above description of the background art ismerely provided for clear and complete explanation of certainembodiments herein and for easy understanding by those skilled in theart. And it should not be understood that the above technical solutionis known to those skilled in the art as it is described in thebackground art.

SUMMARY

The embodiments provide a method for resource allocation, method for CDItransmission, base station and UE. The base station may allocateresources according to the number of relevant downlink CCs to which theaperiodic CSI needing to be reported by the UE corresponds, such thatthe manner of resource allocation is flexible, and supports thetransmission of UCI containing aperiodic CSI in case of multiplecarriers, thereby efficiently improving the probability of correctreceiving of the UCI and reducing the limitation of the scheduling ofthe data transmission.

An aspect according to certain embodiments provides a method forresource allocation, includes:

determining, by a base station, that a UE should report aperiodic CSI ofrelevant downlink CCs; and allocating, by the base station,corresponding resources to the UE according to the number of therelevant downlink CCs.

Another aspect according to certain embodiments provides a base station,including:

a first determining unit for determining that a UE should reportaperiodic CSI of relevant downlink CCs; and

a resource allocating unit for allocating corresponding resources to theUE according to the number of the relevant downlink CCs.

A still another aspect according to certain embodiments provides atransmission method for UCI, comprising:

generating by a base station downlink control information, the downlinkcontrol information comprising triggering information which indicates aUE whether to report aperiodic CSI of relevant downlink CCs andindicates the indices and number of the relevant downlink CCs whenreporting the aperiodic CSI of the relevant downlink CCs, the index ofmodulation and coding scheme, and used resources; wherein the usedresources are resources allocated to the UE by the base stationaccording to the number of the relevant downlink CCs; and

transmitting the downlink control information to the UE by the basestation, so that the UE transmits the aperiodic CSI according to thetriggering information, the index of modulation and coding scheme andthe used resources.

Still another aspect according to certain embodiments provides atransmission method for CSI, including:

receiving, by UE, downlink control information transmitted by a basestation, the downlink control information comprising triggeringinformation which indicates the UE whether to report aperiodic CSI ofrelevant downlink CCs and indicates the indices and number of therelevant downlink CCs when reporting the aperiodic CSI of the relevantdownlink CCs, the index of modulation and coding scheme, and usedresources; wherein the used resources are resources allocated to the UEby the base station according to the number of the relevant downlinkCCs; and

transmitting by the UE the aperiodic CSI according to the triggeringinformation, the index of modulation and coding scheme and the usedresources contained in the downlink control information.

Still another aspect according to certain embodiments provides a basestation, including:

an information generating unit for generating downlink controlinformation, the downlink control information comprising triggeringinformation which indicates UE whether to report aperiodic CSI ofrelevant downlink CCs and indicates the indices and number of therelevant downlink CCs when reporting the aperiodic CSI of the relevantdownlink CCs, an index of modulation and coding scheme, and usedresources; wherein the used resources are resources allocated to the UEby the base station according to the number of the relevant downlinkCCs; and

a first information transmitting unit for transmitting the downlinkcontrol information to the UE, so that the UE transmits the aperiodicCSI according to the triggering information, the index of modulation andcoding scheme, and the used resources contained in the downlink controlinformation.

Still another aspect according to certain embodiments provides a UE,comprising:

an information receiving unit for receiving downlink control informationtransmitted by a base station, the downlink control informationcomprising triggering information which indicates the UE whether toreport aperiodic CSI of relevant downlink CCs and indicates the indicesand number of the relevant downlink CCs when reporting the aperiodic CSIof the relevant downlink CCs, an index of modulation and coding scheme,and used resources; wherein the used resources are resources allocatedto the UE by the base station according to the number of the relevantdownlink CCs; and

a second information transmitting unit for transmitting the aperiodicCSI according to the triggering information, the index of modulation andcoding scheme and the used resources contained in the downlink controlinformation.

A further still another aspect according to certain embodiments providesa storage medium in which a computer-readable program is stored, whereinthe computer-readable program enables the computer to carry out themethod for allocating resources as described above in a base station.

A further still another aspect according to certain embodiments providesa computer-readable program, wherein when the program is executed in abase station, the program enables the computer to carry out thetransmission method for CSI as described above in the base station.

A further still another aspect according to certain embodiments providesa storage medium in which a computer-readable program is stored, whereinthe computer-readable program enables the computer to carry out thetransmission method for CSI as described above in a base station.

A further still another aspect according to certain embodiments providesa computer-readable program, wherein when the program is executed in UE,the program enables the computer to carry out the transmission methodfor CSI as described above in the UE.

A further still another aspect according to certain embodiments providesa storage medium in which a computer-readable program is stored, whereinthe computer-readable program enables the computer to carry out thetransmission method for CSI as described above in UE.

The advantages of certain embodiments exist in that the base station mayallocate resources according to the number of relevant downlink CCs towhich the aperiodic CSI needing to be reported by the UE corresponds,such that the manner of resource allocation is flexible, and supportsthe transmission of UCI containing aperiodic CSI in case of multiplecarriers, thereby efficiently improving the probability of correctreceiving of the UCI and reducing the limitation of the scheduling ofthe data transmission.

With reference to the following description and drawings, certainembodiments are disclosed in detail, and the principles and the mannersof use are indicated. It should be understood that the scope of theembodiments is not limited thereto. The embodiments contain manyalternations, modifications and equivalents within the spirits and scopeof the terms of the appended claims.

Features that are described and/or illustrated with respect to oneembodiment may be used in the same way or in a similar way in one ormore other embodiments and/or in combination with or instead of thefeatures of the other embodiments.

It should be emphasized that the term “comprises/comprising” when usedin this specification is taken to specify the presence of statedfeatures, integers, steps or components but does not preclude thepresence or addition of one or more other features, integers, steps,components or groups thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the embodimentswill become more obvious from the following description with referenceto the drawings. In the drawings:

FIG. 1 is a flowchart of the method for resource allocation ofembodiment 1;

FIG. 2 is a schematic diagram of the structure of the base station ofembodiment 2;

FIG. 3 is a schematic diagram of the structure of the resourceallocating unit of embodiment 2;

FIG. 4 is a flowchart of the method for transmitting UCI of embodiment3;

FIG. 5 is a schematic diagram of the structure of the base station ofembodiment 4;

FIG. 6 is a flowchart of the method for transmitting UCI of embodiment5;

FIG. 7 is a flowchart of implementation of step 602 of embodiment 5;

FIG. 8 is a flowchart of implementation of step 703 of embodiment 5;

FIG. 9 is a schematic diagram of the structure of the UE of embodiment6;

FIG. 10 is a schematic diagram of the structure of the secondinformation transmitting unit of FIG. 9;

FIG. 11 is a schematic diagram of the structure of the second judgingunit of FIG. 10;

FIG. 12 is a flowchart of the method for transmitting UCI at a basestation side of embodiment 7; and

FIG. 13 is a flowchart of the method for transmitting UCI at a UE sideof embodiment 7.

DETAILED DESCRIPTION

The embodiments are described as follows with reference to the drawings.These embodiments are illustrative only and are not intended to limitthe present invention. For easy understanding of certain principles andembodiments by those skilled in the art, the embodiments are describedtaking an LTE-A system with a bandwidth of 10 MHz as an example.However, it should be understood that certain embodiments are notlimited to the above system and is applicable to other systems relatedto aperiodic CSI transmission of multiple carriers.

FIG. 1 is a flowchart of the method for resource allocation ofembodiment 1. As shown in FIG. 1, the method comprises:

step 101: determining, by a base station, that a UE should reportaperiodic CSI of relevant downlink CCs; and

step 102: allocating, by the base station, corresponding resources tothe UE according to the number of the relevant downlink CCs.

It can be seen from the above embodiment that the base station mayallocate resources according to the number of relevant downlink CCs towhich the aperiodic CSI needing to be reported by the UE corresponds,such that the manner of resource allocation is flexible, and supportsthe transmission of UCI containing aperiodic CSI in case of multiplecarriers, thereby overcoming the defect existed in the prior art.

In this embodiment, the aperiodic CSI may comprise a CQI, and alsoinformation of PMI and RI for some downlink transmission modes.

In this embodiment, the aperiodic CSI may be contained in UCI and betransmited to the base station via a PUSCH. In addition, ACK/NACKinformation may also be contained in the UCI together with the CSI fortransmitting to the base station via a PUSCH. Whether the ACK/NACKinformation is transmitted together with the CSI is similar to the priorart, which shall not described any further. In this way, the basestation may select typical modulation and coding scheme, multi-antennaprocessing and HARQ on the basis of the UCI reported by the UE, andadaptively adjusts data transmission dynamically.

In this embodiment, the number of the relevant downlink CCs may be oneor more, and the base station allocates resources to the UE according tothe number of the relevant downlink CCs.

In this embodiment, the method of allocating by the base stationcorresponding resources to the UE according to the number of therelevant downlink CCs may as follows:

the maximum number of the resource blocks (RBs) allocated by the basestation to the UE is a predefined first number L1 if the base stationdetermines that it is necessary for the UE to report the aperiodic CSIof one downlink CC; and the maximum number of the RBs allocated by thebase station to the UE is a predefined second number L2 if the basestation determines that it is necessary for the UE to report theaperiodic CSI of more than one downlink CCs;

wherein the second number L2 is greater than the first number L1, andthe first number L1 and the second number L2 are determined according toa CCR (Channel Coding Rate). The CCR is within a predefined range bydetermining the first number L1 and the second number L2. Of course, insome cases, it is possible that the use of the above first number L1 andthe second number L2 will make the CCR out of a reasonable range.However, such cases are seldom. Hence, the above first number L1 and thesecond number L2 are usually considered as being reasonable.

Following description is provided for the above first number L1 and thesecond number L2 taking one downlink CC and two downlink CCs asexamples.

When there is one downlink CC, such as a case similar to an LTE system,if a predefined CCR is less than ⅓, the maximum of the first number L1is 4, that is, the base station allocates 4 RBs to the UE at most, whichmakes the CCR within a reasonable range.

Where there are multiple CCs, taking two CCs as an example, if the CCRis still ⅓, the second number L2 should be any value greater than 4.However, in this embodiment, in order not to affect the normaltransmission of other data or information in the system, when CSI iscontained in UCI for transmission, the second number L2 should be keptas small as possible on the premise that the correct receiving of theUCI is ensured.

Table 1 shows the corresponding values of the CCR in the transmission ofvarious UCI and sounding reference signals (SRSs) in three typical casesof bit lengths of aperiodic CSI (i.e. the payload is 100, 136 and 144,respectively) when the number of the downlink CCs is 2 and the number ofthe allocated resources is 4. Table 2 shows corresponding values of theCCR in the transmission of various UCI and SRSs in three typical casesof bit lengths of aperiodic CSI when the number of the downlink CCs is 2and the number of the allocated resources is 5. Table 3 showscorresponding values of the CCR in the transmission of various UCI andSRSs in three typical cases of bit lengths of aperiodic CSI when thenumber of the downlink CCs is 2 and the number of the allocatedresources is 6.

It can be seen from Table 1 that when the number of the downlink CCs is2, if 4 RBs are still allocated, when the payload of the aperiodic CSIis respectively 136 and 144, the CCR goes beyond the predefined range inthe transmission of CQI+A/N+RI or in the transmission of CQI+A/N+SRS+RI;and when the payload of the aperiodic CSI is 100, the CCR goes beyondthe predefined range in the transmission of CQI+A/N+SRS+RI. Thus, thecorrect receiving of the UCI by the base station cannot be ensured.

TABLE 1 CQI + CQI + CQI + A/ CQI + RI + CQI + A/ CQI + A/N + Payload CQICQI + SRS A/N RI N + SRS SRS N + RI RI + SRS 100 0.087 0.095 0.13 0.130.149 0.149 0.26 0.347 136 0.118 0.129 0.177 0.177 0.202 0.202 0.3540.472 144 0.125 0.136 0.188 0.188 0.214 0.214 0.375 0.5

TABLE 2 CQI + CQI + CQI + CQI + A/ CQI + RI + CQI + A/ CQI + A/N +Payload CQI SRS A/N RI N + SRS SRS N + RI RI + SRS 100 0.069 0.076 0.1040.104 0.119 0.119 0.208 0.278 136 0.094 0.103 0.142 0.142 0.162 0.1620.283 0.378 144 0.1 0.109 0.15 0.15 0.171 0.171 0.3 0.4

TABLE 3 CQI + CQI + CQI + CQI + A/N + CQI + RI + CQI + A/N + CQI + A/N +Payload CQI SRS A/N RI SRS SRS RI RI + SRS 100 0.058 0.063 0.087 0.0870.099 0.099 0.174 0.232 136 0.079 0.086 0.118 0.118 0.135 0.135 0.2360.315 144 0.083 0.091 0.125 0.125 0.143 0.143 0.25 0.333

It can be seen from Table 2 that if the number of the RBs is 5, the CCRgoes beyond the predefined range only when the payload of the aperiodicCSI is 136 and CP=144, and the CQI+A/N+SRS+RI is transmitted. However,the case of transmitting CQI+A/N+SRS+RI is seldom. Hence, the number ofthe RBs being 5 is considered as being a reasonable number.

It can be seen from Table 3 that if the number of the RBs is 6, the CCRis within the predefined range.

It can be seen from above that in determining the number of theallocated resources, not only to make the CCR within a reasonable range,but also to make the number of resources as small as possible are bothshould be considered, so as to alleviate the effect on the transmissionof other resources. It has been proved that it is optimal when themaximum value of the second number L2 is 5 or 6 in case of two CCs.

The case of two CCs is explained above. For cases of more than two CCs,the methods for determining the second number L2 are similar to what isdescribed above. In addition, the method for calculating CCR is similarto the prior art, which shall not be described any further.

It can be seen from the above embodiment that the base station mayallocate resources according to the number of relevant downlink CCs towhich the aperiodic CSI needing to be reported by the UE corresponds,such that the manner of resource allocation is flexible, and supportsthe transmission of UCI containing aperiodic CSI in case of multiplecarriers, thereby overcoming the defect existed in the prior art.

It should be understood by those skilled in the art that all or part ofthe steps in the method of the above embodiment may be carried out byrelevant hardware with instructions from a program. The program may bestored in a computer-readable storage medium. All or part of the stepsin the method of the above embodiment may be included in the executionof this program. The storage medium may comprise an ROM, an RAM, afloppy disc, and a CD, etc.

The embodiments also provide a base station as described below. Sincethe principle of the base station for solving the problems is similar tothat of the method for resource allocation based on a base station, theembodiments of the method may be referred to in the embodiments of thebase station, and the similar parts shall not be described any further.

FIG. 2 is a schematic diagram of the structure of the base station ofembodiment 2. As shown in FIG. 2, the base station comprises: a firstdetermining unit 201 and a resource allocating unit 202; wherein

the first determining unit 201 is used for determining that a UE shouldreport aperiodic CSI of relevant downlink CCs, and the resourceallocating unit 202 is used for allocating corresponding resources tothe UE according to the number of the relevant downlink CCs.

FIG. 3 is a schematic diagram of the structure of the resourceallocating unit of FIG. 2. As shown in FIG. 3, the resource allocatingunit 202 may comprise a first resource allocating unit 301 and a secondresource allocating unit 302; wherein the first resource allocating unit301 is used for allocating maximum resources of a predefined firstnumber L1 to the UE if the first determining unit 201 determines that itis necessary for the UE to report the aperiodic CSI of one downlink CC,

the second resource allocating unit 302 is used for allocating maximumresources of a predefined second number L2 to the UE if the firstdetermining unit 201 determines that it is necessary for the UE toreport the aperiodic CSI of more than one downlink CCs;

wherein the second number L2 is greater than the first number L1, andthe first number L1 and the second number L2 are determined according toa CCR.

In this embodiment, the manner for determining the first number L1 andthe second number L2 is as described in embodiment 1, and shall not bedescribed any further.

It can be seen from the above embodiment that the base station mayallocate resources according to the number of relevant downlink CCs towhich the aperiodic CSI needing to be reported by the UE corresponds,such that the manner of resource allocation is flexible, and supportsthe transmission of UCI containing aperiodic CSI in case of multiplecarriers, thereby overcoming the defect existed in the prior art.

FIG. 4 is a flowchart of the method for UCI transmission of embodiment3. As shown in FIG. 4, the method comprises:

step 401: generating by a base station DCI, the DCI comprisingtriggering information which indicates a UE whether to report aperiodicCSI of relevant downlink CCs and indicates the indices and number of therelevant downlink CCs when reporting the aperiodic CSI of the relevantdownlink CCs, the index of modulation and coding scheme, and usedresources; wherein the used resources are resources allocated to the UEby the base station according to the number of the relevant downlinkCCs; and

step 402: transmitting the DCI to the UE by the base station, so thatthe UE transmits the aperiodic CSI according to the triggeringinformation, the index of modulation and coding scheme and the usedresources contained in the DCI.

In this embodiment, in step 401, when the base station determines thatit is necessary for the UE to report the aperiodic CSI of the relevantdownlink CCs, it can generate the DCI according to the transmission modeand the demand of the system, so as to instruct the UE to report theUCI; wherein in generating the DCI, the base station allocates the usedresources to the UE according to the number of the relevant downlinkCCs. Furthermore, corresponding triggering information and a predefinedindex of modulation and coding scheme may be selected according topreconfigured corresponding relationship between the triggeringinformation and the downlink CCs.

In this embodiment, an existing method may be used in the process ofgenerating the DCI, which shall not be described any further. Inaddition, the method of allocating the used resources to the UE by thebase station according to the number of the relevant downlink CCs is asdescribed in embodiment 1, and shall not be described any further.

In this embodiment, the DCI generated in step 101 may be transmitted ina physical downlink control channel (PDCCH), wherein the bit informationin DCI format 0 or DCI format 4 may be used for bearing thisinformation.

Table 4 shows the bear information and length of the DCI format 0 in theLTE-A system of the embodiments, and Table 5 shows the bear informationand length of the DCI format 4 in the LTE-A system of the embodiments.

TABLE 4 Flag for DCI 0/1A 1 Hopping flag 1 Resource allocation 11Modulation and coding scheme 5 New data indicator 1 Power control forPUSCH 2 Cyclic shift for DMRS and OCC 3 Aperiodic CQI request 2Aperiodic SRS request 1 Multi-cluster flag 1 Payload 28

TABLE 5 Resource allocation 11 Power control for PUSCH 2 Cyclic shiftfor DMRS and OCC 3 Aperiodic CQI request 2 Aperiodic SRS request 2Multi-cluster flag 1 Modulation and coding scheme for 1^(st) TB 5 Newdata indicator for 1^(st) TB 1 Modulation and coding scheme for 2^(nd)TB 5 New data indicator for 2^(nd) TB 1 PMI/RI 3/6 Payload 36/39

Wherein, the “CQI request” with 2 bits in Table 4 or Table 5 may be usedto bear the above triggering information. Hence, the correspondingstates may be “00”, “01”, “10” and “11”. The above four states may berespectively used to indicate whether to report aperiodic CSI, and a setof different downlink CCs in indicating to report aperiodic CSI.

For example, when the two bits are “00”, it may indicate not to reportthe aperiodic CSI, but to transmit uplink data on the PUSCH only; whenthe two bits are “01/10”, it may indicate to report the aperiodic CSI,and the number of the downlink CCs contained in the downlink CC set is1; and when the two bits are “11”, it may indicate to report theaperiodic CSI, and the number of the downlink CCs contained in thedownlink CC set is more than 1, such as two CCs, it may also indicatethe index of each CC. Such corresponding relationship may be configuredat the base station side via high layer signaling and stored for use bythe base station in generating the DCI. The above manner of indicationis merely an embodiment, and the above triggering information may alsobe configured as the cases may be.

In this embodiment, when the aperiodic CSI is contained in the UCI andbe transmitted to the base station via the PUSCH, the transmission ofthe UCI containing the aperiodic CSI via the PUSCH may be classifiedinto: 1) the UCI is separately transmitted on the PUSCH (CQI-onlyPUSCH), i.e. the uplink data is not transmitted when the aperiodic CSIis transmitted; and 2) the aperiodic CSI is transmitted together withthe uplink data on the PUSCH, i.e. the uplink data is also transmittedwhen the aperiodic CSI is transmitted. Wherein, which manner is used fortransmitting the UCI may be judged according to the triggeringinformation, the modulation and coding scheme, and used resources, whichshall be described in detail in embodiment 5.

In this embodiment, the base station needs to configure multiple groupsof relevant downlink CC sets in advance for UE, correspondingly storethe sets, together with the triggering information, such as the 2 bitsinformation in DCI format 0/4, and also store the correspondingrelationship at the UE side, for the UE to judge whether to transmitaperiodic CSI and in transmitting the aperiodic CSI, to determine thenumber and indices of the relevant downlink CCs.

Thus, in this embodiment, before the base station generates DCI for theUE being required to report the aperiodic CSI, the method furthercomprises:

configuring, by the base station, the UE with a plurality groups ofrelevant downlink CC sets; storing correspondingly the triggeringinformation and the plurality groups of relevant downlink componentcarrier sets; and

selecting, by the base station, corresponding triggering informationaccording to the indices and the number of the relevant downlink CCswhen generating the DCI.

For example, the following description is provided taking that theaperiodic CSI is contained in the UCI for transmission as an example.Table 6 and Table 7 respectively shows the corresponding relationshipbetween the triggering information configured by the base station of theembodiments and a plurality groups of relevant downlink CC sets.However, Table 6 and Table 7 are merely embodiments, certain embodimentsare not limited thereto, and the base station may configure as the casesmay be.

TABLE 6 Triggering information Downlink CC sets 00 UCI containing theaperiodic CSI is not transmitted 01 UCI containing the aperiodic CSI of1 downlink CC is transmitted, with the index of the downlink CC being 1(the downlink CC is the pairing downlink CC configured via the systeminformation for the uplink CC of the PUSCH carrying the UCI) 10 UCIcontaining the aperiodic CSI of 1 downlink CC is transmitted, with theindex of the downlink CC being 2 11 UCI containing the aperiodic CSI of2 downlink CCs is transmitted, with the indices of the downlink CCsbeing 1 and 2

TABLE 7 Triggering information Downlink CC sets 00 UCI containing theaperiodic CSI is not transmitted 01 UCI containing the aperiodic CSI of1 downlink CC is transmitted, with the index of the downlink CC being 2(the downlink CC is the pairing downlink CC configured via the systeminformation for the uplink CC of the PUSCH carrying the UCI) 10 UCIcontaining the aperiodic CSI of 2 downlink CCs is transmitted, with theindices of the downlink CCs being 1 and 2 11 UCI containing theaperiodic CSI of all the 5 configured or activated downlink CCs istransmitted, with the indices of the downlink CCs being 1, 2, 3, 4 and 5It can be seen from above that if the base station is configured withthe corresponding relationship as shown in Table 7, the correspondingrelationship is also stored at the UE side. For example, if the basestation learns that it is necessary for the UE to report the CSI of allthe downlink CCs configured by the system and the CSI are contained inthe UCI for transmission, the base station may learn through Table 7that the corresponding triggering information is “11”, and uses the “CQIrequest” in the DCI to carry the triggering information “11”. Thus, whenthe UE receives the DCI, it may read triggering information “11” fromthe DCI, and learns, by looking up Table 7, that the report contains theUCI of the aperiodic CSI of all the downlink CCs configured by thesystem.

In the embodiments, in the relevant downlink CC set, when the number ofthe relevant downlink CCs is 1, the relevant downlink CC may be thepairing downlink CC configured by the uplink CC of the PUSCH carryingthe UCI via a system information block (SIB-2), as the cases to whichthe triggering information “01” in Table 6 and Table 7 corresponds; inaddition, the relevant downlink CC may not be the downlink CC, linkedvia an SIB-2, to which the uplink CC of the PUSCH carrying the aperiodicCSI corresponds, as the case to which “10” in Table 6 corresponds.

For example, an uplink component carrier (UL CC) is configured with ULCC #1 and UL CC #2, and a downlink CC is configured with DL CC #1, DL CC#2 and DL CC #3; wherein the relationship between UL CC #1 and DL CC #1is linked by an SIB-2, and the relationship between UL CC #2 and DL CC#3 is linked by an SIB-2, but DL CC #2 has no UL CC linked by the SIB-2.The UCI of DL CC #2 may be transmitted via UL CC #1 or UL CC #2. Forexample, if DCI format 0 is used to schedule the PUSCH on UL CC #1, whenthe triggering information in DCI format 0 is “10”, it indicates thatthe aperiodic CSI of DL CC #2 will be transmitted on the PUSCH at UL CC#1.

In this embodiment, in the relevant downlink CC set, when the number ofthe relevant downlink CCs is more than 1, the relevant downlink CC maybe more than one configured or activated downlink CCs, as the case towhich “11” in Table 7 corresponds, and may be other downlink CCs, as thecases to which “11” in Table 6 and “10” in Table 7 correspond.

It can be seen from the above embodiment that the base station mayallocate resources according to the number of relevant downlink CCs towhich the aperiodic CSI needing to be reported by the UE corresponds,such that the manner of resource allocation is flexible, and supportsthe transmission of UCI containing aperiodic CSI in case of multiplecarriers, thereby overcoming the defect existed in the prior art. Andwhen the UE transmits the UCI containing the aperiodic CSI by using theresources allocated by the base station according to the number of thedownlink CCs, the accuracy of receiving information by the base stationmay be ensured, and the limitation of the scheduling of the datatransmission may be reduced.

Certain embodiments provide a base station as described below inembodiment 4. Since the principle of the base station for solving theproblems is similar to that of the method for UCI transmission based ona base station in embodiment 3, the embodiments of the method may bereferred to in the embodiments of the base station, and the similarparts shall not be described any further.

FIG. 5 is a schematic diagram of the structure of the base station ofembodiment 4. As shown in FIG. 5, the base station comprises aninformation generating unit 501 and a first information transmittingunit 502, wherein

the information generating unit 501 is used for generating DCI, the DCIcomprising triggering information which indicates UE whether to reportaperiodic CSI of relevant downlink CCs and indicates the indices andnumber of the relevant downlink CCs when reporting the aperiodic CSI ofthe relevant downlink CCs, an index of modulation and coding scheme, andused resources; wherein the used resources are resources allocated tothe UE by the base station according to the number of the relevantdownlink CCs; and

the first information transmitting unit 502 is used for transmitting theDCI to the UE, so that the UE transmits the aperiodic CSI according tothe triggering information, the index of modulation and coding scheme,and the used resources contained in the DCI.

In this embodiment, when the information generating unit 501 determinesthat it is necessary for the UE to report the aperiodic CSI of therelevant downlink CCs, it may generate the DCI according to thetransmission mode and demand of the system, so as to instruct the UE toreport the aperiodic CSI; wherein in the generated DCI, the usedresources are those allocated to the UE by the base station according tothe number of relevant downlink CCs.

In this embodiment, the DCI may be transmitted in a PUSCH. Wherein, thetriggering information may be carried by using the “CQI request” with 2bits in DCI format 0 or 4. Details are as described in embodiment 3,which shall not be described any further.

In this embodiment, the base station further comprises a resourceallocating unit 503 for allocating corresponding resources to the UEaccording to the number of the relevant downlink CCs. In particular, theresource allocating unit 503 may comprise a first resource allocatingunit and a second resource allocating unit (not shown and similar to 301and 302 in FIG. 3, respectively); wherein the first resource allocatingunit is used for allocating maximum resources of a predefined firstnumber L1 to the UE when it is necessary for the UE to report theaperiodic CSI of one downlink CC; and the second resource allocatingunit is used for allocating maximum resources of a predefined secondnumber L2 to the UE when it is necessary for the UE to report theaperiodic CSI of more than one downlink CCs; wherein the second numberL2 is greater than the first number L1, and the first number L1 and thesecond number L2 are determined based on a CCR. The specific embodimentof determining L1 and L2 is as described in embodiment 1, which shallnot be described any further.

Furthermore, as shown in FIG. 5, the base station may comprise aconfiguring unit 505 and a storing unit 506; wherein the configuringunit 505 is used for configuring the UE with a set of a plurality ofrelevant downlink CCs; wherein the base station may performconfiguration via high layer signalling, such as RRC; and the storingunit 506 is used for correspondingly storing the triggering informationand a plurality of groups of sets of relevant downlink CCs, as shown inTable 6 and Table 7.

Thus, when the information generating unit 501 generates the downlinkDCI, it selects corresponding triggering information according to theindices and number of the relevant downlink CCs.

It can be seen from the above embodiment that when the informationgenerating unit 501 determines it is necessary for the UE to report theaperiodic CSI of the relevant downlink CCs, it may select correspondingtriggering information, modulation and coding scheme and used resourcesto generate DCI in accordance with actual situation, and then transmitsabove information to the UE. Since the base station may allocateresources in accordance with the number of the downlink CCs, the mannerof resource allocation becomes flexible, and the transmission of UCI incase of multiple carriers is supported.

FIG. 6 is a flowchart of the method for UCI transmission of embodiment5. As shown in FIG. 6, the method comprises:

step 601: receiving, by UE, DCI transmitted by a base station, the DCIcomprising triggering information which indicates the UE whether toreport aperiodic CSI of relevant downlink CCs and indicates the indicesand number of the relevant downlink CCs when reporting the aperiodic CSIof the relevant downlink CCs, the index of modulation and coding scheme,and used resources; wherein the used resources are resources allocatedto the UE by the base station according to the number of the relevantdownlink CCs;

wherein, the base station may transmits the DCI via a PCCCH, and the UEmay read the triggering information, index of modulation and codingscheme (MCS) and the used resource blocks from the DCI;

step 602: transmitting by the UE the aperiodic CSI according to thetriggering information, the index of modulation and coding scheme andthe used resources contained in the DCI.

Wherein, the UE reports the aperiodic CSI via the UCI, and the UCI istransmitted to the base station via a PUSCH. The transmission of the UCIvia the PUSCH may be classified into: 1) the UCI is separatelytransmitted via the PUSCH (CQI-only PUSCH), i.e. the uplink data is nottransmitted when the aperiodic CSI is transmitted; and 2) the aperiodicCSI is transmitted together with the uplink data via the PUSCH, i.e. theuplink data is also transmitted when the aperiodic CSI is transmitted.Wherein, which manner is used for transmitting the UCI may be judgedaccording to a particular combination of the triggering information, themodulation and coding scheme, and the number of used resources.Following is the detailed description.

Following description is provided taking that the CSI is contained inthe UCI and be transmitted to the base station via a PUSCH as anexample. In addition, ACK/NACK information may also be transmittedtogether with the aperiodic CSI to the base station via the UCI. Whetherthe ACK/NACK information is transmitted together with the aperiodic CSIis similar to the prior art, which shall not described any further.

FIG. 7 is a flowchart of implementation of step 602 of embodiment 5. Asshown in FIG. 7, the following manner may be used for the UE to transmitthe aperiodic CSI in accordance with the triggering information, theindex of modulation and coding scheme, and the used resources containedin the DCI:

step 701: judging, by the UE, whether it is necessary to reportaperiodic CSI of relevant downlink CCs according to the triggeringinformation in received DCI; executing step 702 if the result ofjudgement is positive; and executing step 705 if the result of judgementis negative;

wherein, the triggering information may be carried using the “CQIrequest” with 2 bits in DCI format 0 or DCI format 4;

the UE may determine whether to report the aperiodic CSI of the relevantdownlink CCs in accordance with the triggering information and prestoredcorresponding relationship between the triggering information and thedownlink CC sets;

for example, according to the corresponding relationship in Table 6 orTable 7, if the 2 bits information is “00”, the UE may determine that itis not necessary to report the aperiodic CSI; and if in the DCI, the 2bits information is “11/01/10”, the UE may determine that it isnecessary to report the aperiodic CSI, and may learn the number andindices of the relevant downlink CCs from Table 6 or Table 7;

step 702: determining by the UE the indices and number of the relevantdownlink CCs according to the triggering information and prestoredcorresponding relationship between the triggering information and thedownlink CC sets if the result of judgement in step 701 is that it isnecessary to report the aperiodic CSI;

for example, it may be determined in accordance with the correspondingrelationship in Table 6 or Table 7. For example, if it determines thatthe triggering information is “01”, it may be learnt that the UCIcontaining the aperiodic CSI of 1 downlink CC is transmitted, and theindex of the downlink CC is 1;

step 703: judging, according to the determined number of the relevantdownlink CCs and the corresponding index of modulation and coding schemeand used resources, whether to only transmit the UCI containing theaperiodic CSI; and executing step 704 if the result of judgement is thatthe UCI is only transmitted, otherwise, executing step 706;

wherein, the particular process of judgement will be described in detailbelow with reference to FIG. 8;

step 704: transmitting at a predefined time, by the UE, the UCIcontaining the aperiodic CSI via a PUSCH on the resources which areallocated to the UE by the base station, and not transmitting the uplinkdata at the same time, if the result of judgement in step 703 ispositive;

wherein, the UE transmits the UCI containing the aperiodic CSI on theused resources allocated by the base station to the UE, and ACK/NACKinformation may be contained in the UCI for transmission together withthe aperiodic CSI;

step 705: transmitting only the uplink data by the UE on the PUSCH, ifthe result of judgement in step 701 is negative;

step 706: transmitting, by the UE, the UCI containing the aperiodic CSIon the resources which are allocated to the UE by the base station, ifthe result of judgement in step 703 is negative;

wherein, when the UCI containing the aperiodic CSI and the uplink dataare transmitted, the UCI containing the aperiodic CSI may be multiplexedwith the uplink data and be transmitted together to the base station onthe PUSCH; that is, part of the resources of the uplink data are usedwhen the UCI containing the aperiodic CSI is transmitted, and extrasignalling which used to indicate this part of the resources is notnecessary, this part of the resources may be agreed in advance to beused in such a case between the UE and the base station.

FIG. 8 is a flowchart of implementation of step 703 of embodiment 5. Asshown in FIG. 8, it comprises:

step 801: judging whether the number of the relevant downlink CCs is oneor more than one; executing step 802 if the result of judgement is thatthe number is 1, and executing step 805 if the result of judgement isthat the number is more than 1;

step 802: judging further whether the index of modulation and codingscheme is a first predefined value and whether the number of the usedresources is less than or equal to a first number when the relevantdownlink CCs is one; executing step 803 if the result of judgement ispositive, otherwise, executing step 804;

in this embodiment, judging whether the index of modulation and codingscheme is 29, and whether the number of the used resources is not morethan 4;

step 803: determining that the UCI containing the aperiodic CSI is onlytransmitted and the uplink data is not transmitted, if the result ofjudgement in step 802 is positive;

step 804: determining that the UCI containing the aperiodic CSI and theuplink data are transmitted, if the result of judgement in step 802 isnegative;

step 805: judging further whether the index of the modulation and codingscheme is a second predefined value and whether the number of the usedresources is less than or equal to a second number; executing step 806if the result of judgement is positive, otherwise, executing step 805;

in this embodiment, judging whether the index of modulation and codingscheme is 29, and whether the number of the used resources is not morethan L; wherein the second number L is greater than the first number andpreferably 5 or 6;

step 806: determining that the UCI containing the aperiodic CSI is onlytransmitted and the uplink data is not transmitted, if the result ofjudgement in step 805 is positive; and

step 807: determining that the UCI containing the aperiodic CSI and theuplink data are transmitted, if the result of judgement in step 805 isnegative.

It can be seen from the above embodiment that the UE may determine thenumber of the relevant downlink CCs according to the received triggeringinformation, thereby determining the transmission of the aperiodic CSIaccording to the number of the relevant downlink CCs, the modulation andcoding scheme and the used resources, and the aperiodic CSI may becontained in the UCI for transmission; such a method is applicable tothe transmission of UCI in case of multiple carriers, thereby overcomingthe defect existed in the prior art.

Certain embodiments also provide UE as described below in embodiment 6.Since the principle for the UE to solve the problems is similar to thatof the method for UCI transmission based on a base station as describedabove, the embodiments of the method may be referred to in theembodiments of the UE, and the similar parts shall not be described anyfurther.

FIG. 9 is a schematic diagram of the structure of the UE of embodiment6. As shown in FIG. 9, the UE comprises an information receiving unit901 and a second information transmitting unit 902; wherein

the information receiving unit 901 is used for receiving DCI transmittedby a base station, the DCI comprising triggering information whichindicates the UE whether to report aperiodic CSI of relevant downlinkCCs and indicates the index and number of the relevant downlink CCs whenreporting the aperiodic CSI of the relevant downlink CCs, an index ofmodulation and coding scheme, and used resources; wherein the usedresources are resources allocated to the UE by the base stationaccording to the number of the relevant downlink CCs; and

the second information transmitting unit 902 is used for transmittingthe aperiodic CSI according to the triggering information, the index ofmodulation and coding scheme and the used resources contained in thedownlink control information. FIG. 10 is a schematic diagram of thestructure of the second information transmitting unit of FIG. 9. Asshown in FIG. 10, the second information transmitting unit 902comprises:

a first judging unit 1001 for judging whether it is necessary to reportaperiodic CSI of relevant downlink CCs according to triggeringinformation;

a carrier determining unit 1002 for determining the indices and numberof the relevant downlink CCs according to the triggering information andprestored corresponding relationship between the triggering informationand downlink CC sets, if the result of judgement of the first judgingunit 1001 is that it is necessary to report aperiodic CSI of relevantdownlink CCs;

a second judging unit 1003 for judging whether only the aperiodic CSI istransmitted according to the number of the relevant downlink CCsdetermined by the carrier determining unit 1002, a corresponding indexof modulation and coding scheme and the used resources;

a third information transmitting unit 1004 for transmitting theaperiodic CSI on the resources allocated by the base station to the UE,if the result of judgement of the second judging unit 1003 is that theuplink data is not transmitted when the aperiodic CSI is transmitted;and

a fourth information transmitting unit 1005 for transmitting theaperiodic CSI and the uplink data on the resources allocated by the basestation to the UE, if the result of judgement of the second judging unit1003 is that not only the aperiodic CSI but also the uplink data aretransmitted.

Furthermore, the UE may comprise a storing unit (not shown) for storingthe corresponding relationship between the triggering information andthe downlink CC sets, for use by the UE.

FIG. 11 is a schematic diagram of the structure of the second judgingunit of FIG. 10. As shown in FIG. 11, the second judging unit 1003comprises:

a third judging unit 1101 for judging whether the number of the relevantdownlink CCs is one or more;

a fourth judging unit 1102 for further judging whether the index of themodulation and coding scheme contained in the DCI is a predefined indexand whether the number of the used resources is less than or equal to afirst predefined value, if the result of judgement of the third judgingunit 1101 is that the number of the relevant downlink CCs is one; or,for further judging whether the index of the modulation and codingscheme contained in the DCI is a predefined index and whether the numberof the used resources is less than or equal to a second predefinedvalue, if the result of judgement of the third judging unit 1101 is thatthe number of the relevant downlink CCs is more than one; wherein thesecond number is greater than the first number, and the first number andthe second number are determined according to a CCR;

a first determining unit 1103 for determining that the uplink data isnot transmitted when the aperiodic CSI is transmitted, if the result ofthe fourth judging unit 1102 is positive; and

a second determining unit 1104 for determining that the uplink data isalso transmitted when the aperiodic CSI is transmitted, if the result ofthe fourth judging unit 1102 is negative.

Wherein the UE may report the aperiodic CSI via the UCI, and the UCI istransmitted to the base station via the PUSCH. The manners of embodiment5 shown in FIGS. 7 and 8 may be used for carrying out every functionalunits of the second information transmitting unit 902, which shall notbe described any further.

It can be seen from the above embodiment that the UE may determine thenumber of the relevant downlink CCs according to the received triggeringinformation, thereby determining the transmission of the aperiodic CSIaccording to the number of the relevant downlink CCs, the modulation andcoding scheme and the used resources; such a method is applicable to thetransmission of UCI in case of multiple carriers, ensures the accuracyof receiving information by the base station, and reduces the limitationof the scheduling of the data transmission.

The above embodiment is applicable to an LTE-A system, and a followingexample will be described to explain the present embodiment in detail.In this example, aperiodic CSI is reported via UCI and the index of themodulation and coding scheme is 29; the number of the resources usedwhen the number of the downlink CCs is 1, i.e. the first number L1, isless than or equal to 4, and the number of the resources used when thenumber of the downlink CCs is 2, i.e. the second number L2, is less thanor equal to 5.

FIG. 12 is a flowchart of the method for UCI transmission at a basestation side of embodiment 7. As shown in FIG. 12, the method comprises:

step 1201: configuring the UE by the base station with a pluralitygroups of relevant downlink CC sets; and correspondingly storing thetriggering information and the plurality groups of relevant downlink CCsets;

as shown in Table 6 or Table 7, this embodiment will be described takingTable 6 as an example;

step 1202: generating by the base station a corresponding DCI source bitaccording to the transmission mode and the demand of the system, whenthe base station determines that the UE should report the aperiodic CSIof the relevant downlink CCs, such as the base station determines thatthe UE should report the aperiodic CSI of downlink CCs with indices 1and 2, with the process of generation being similar to the prior art,which shall not be described any further;

wherein, the DCI may contain triggering information “11”, which may becarried by using the “CQI request” in DCI format 0 or 4, with the indexof the modulation and coding scheme being 29, and the number of theresources L2 being 5;

step 1203: adding a cyclic redundancy check (CRC) code by the basestation to the generated DCI source bit;

step 1204: performing the processes of modulation, encoding and ratematching to the DCI source bit added with CRC;

step 1205: forming a PDCCH, mapping to a corresponding physicaltime-frequency resource, and transmitting to the UE via the PDCCH.

FIG. 13 is a flowchart of the method for UCI transmission at a UE sideof embodiment 7. First, the UE detects possible DCI in accordance withthe transmission mode, and then determines whether to transmit the UCIcontaining the aperiodic CSI or whether to transmit only the UCIcontaining the aperiodic CSI according to the detected DCI. As shown inFIG. 13, the method comprises:

step 1301: receiving by the UE the PDCCH on the corresponding resource,and receiving the DCI;

step 1302: performing the processes of de-rate matching, de-modulationand de-coding to the DCI;

step 1303: judging whether the CRC is correct or not; and executing step1304, if the result of judgment is positive, otherwise, executing step1308;

step 1304: further judging whether to transmit the UCI containing theaperiodic CSI in accordance with the triggering information in the DCI,the index of the modulation and coding scheme and the used resources, ifthe result of judgment of step 1303 is that the CRC is correct; andexecuting step 1305 if the result of judgment is to transmit the UCI,otherwise, executing step 1310;

wherein, “11” indicates that the UCI containing the aperiodic CSI of thedownlink CCs with the indices 1 and 2 is transmitted;

step 1305: further determining the number of the downlink CCs, if theresult of judgment in step 1304 is positive;

it can be seen from above that the number of the downlink CCs is 2;

step 1306: further judging whether the index of the modulation andcoding scheme is 29 and whether the number of the used resources is lessthan or equal to 5 according to the number of the downlink CCs; andexecuting step 1306, if the result of judgment is positive, otherwise,executing step 1311;

in this embodiment, if L2 is 5 and the index of the modulation andcoding scheme is 29, the result of judgment is positive;

step 1307: transmitting at a predefined time, by the UE, the UCIcontaining the aperiodic CSI on the resources which are allocated to theUE by the base station, with the UCI containing the aperiodic CSI beingonly transmitted, and the uplink data being not transmitted, if theresult of judgement in step 1305 is positive;

step 1308: if the result of step 1303 is that the CRC is wrong, thenfurther determining whether the CRC exceeds a maximum blind detectiontime, and executing step 1309, if the result of determining is positive,otherwise, returning back to step 1301;

step 1309: abandoning the PDCCH and terminating the process, if theresult of judgment in step 1308 is positive;

step 1310: transmitting the uplink data via the PUSCH only and thenterminating the process (not shown), if the result of judgment in step1304 is negative; and

step 1311: transmitting the uplink data and the UCI containing theaperiodic CSI on the PUSCH, if the result of judgment in step 1306 isnegative;

wherein, the UCI containing the aperiodic CSI may be multiplexed withthe uplink data and be transmitted together to the base station on thePUSCH; that is, part of the resources of the uplink data are used whenthe UCI containing the aperiodic CSI is transmitted, and extrasignalling which used to indicate this part of the resources is notnecessary, this part of the resources may be agreed in advance to beused in such a case between the UE and the base station.

The above embodiment is described taking a plurality of downlink CCs asan example. If the number of the downlink CCs is 1, in step 1306, thejudgment condition is whether the index of modulation and coding schemeis 29 and whether the number of the resources, i.e. L1, is less than orequal to 4. Other processes are similar to those shown in FIG. 13, andshall not be described any further.

Certain embodiments further provide a computer-readable program, whereinwhen the program is executed in a base station, the program enables thecomputer to carry out the method for allocating resources as describedin embodiment 1 in the base station.

Certain embodiments further provide a storage medium in which acomputer-readable program is stored, wherein the computer-readableprogram enables the computer to carry out the method for allocatingresources as described in embodiment 1 in the base station.

Certain embodiments further provide a computer-readable program, whereinwhen the program is executed in a base station, the program enables thecomputer to carry out the method for transmitting CSI as described inembodiments 3 and 7 in the base station.

Certain embodiments further provide a storage medium in which acomputer-readable program is stored, wherein the computer-readableprogram enables the computer to carry out the method for transmittingCSI as described in embodiment 3 and 7 in the base station.

Certain embodiments further provide a computer-readable program, whereinwhen the program is executed in UE, the program enables the computer tocarry out the method for transmitting CSI as described in embodiment 4or 7 in the user equipment.

Certain embodiments further provide a storage medium in which acomputer-readable program is stored, wherein the computer-readableprogram enables the computer to carry out the transmission method forCSI as described in embodiment 4 or 7 in UE.

It can be seen from the above embodiment that the base station mayallocate corresponding resources to the UE in accordance with the numberof relevant downlink CCs, so, resource allocation is flexible, and thetransmission of UCI containing aperiodic CSI in case of multiplecarriers is supported, thereby ensuring the accuracy of receivinginformation by the base station, and reducing the limitation of thescheduling of the data transmission.

Certain embodiments of the aforementioned devices and methods may beimplemented by hardware or by hardware in combination with software.Certain embodiments relate to such a computer-readable program that,when executed by a logical component part, enables the logical componentpart to implement the aforementioned devices or component parts, orenables the logical component part to realize the aforementioned methodsor steps. Certain embodiments further relate to a storage medium forstoring the program, such as a hard disk, a magnetic disk, an opticaldisk, a DVD, or a flash memory, and so on.

Certain embodiments are described above with reference to particularembodiments. However, it should be understood by those skilled in theart that such a description is illustrative only, and not intended tolimit the protection scope of the invention. Various variants andmodifications may be made by those skilled in the art according to thespirits and principle of certain embodiments, and such variants andmodifications fall within the scope of the present invention.

What is claimed is:
 1. A base station, comprising: a control circuitconfigured to: allocate corresponding resources to a user equipmentaccording to a number of relevant downlink component carriers of whichthe user equipment should perform an aperiodic reporting of channelstatus information, allocate maximum resources of a first number to theuser equipment when the user equipment should perform the aperiodicreporting of channel status information of one downlink componentcarrier, and allocate maximum resources of a second number to the userequipment when the user equipment should perform the aperiodic reportingof channel status information of more than one downlink componentcarrier; and a transmitter configured to transmit downlink controlinformation to the user equipment, wherein the downlink controlinformation further comprises an index of coding and modulation scheme,wherein resources are allocated to the user equipment by the basestation according to the number of the relevant downlink componentcarriers, and wherein the user equipment is further configured toperform aperiodic transmission of channel status information accordingto triggering information, the index of coding and modulation scheme andused resources contained in the downlink control information.
 2. Thebase station according to claim 1, wherein the first number is
 4. 3. Thebase station according to claim 1, wherein the second number is greaterthan the first number, and the first number and the second number aredetermined according to a Channel Coding Rate (CCR).
 4. A userequipment, comprising: a receiver configured to receive downlink controlinformation transmitted by a base station, the downlink controlinformation comprising triggering information which indicates whether toperform an aperiodic reporting of channel status information of relevantdownlink component carriers, and when indicated to perform the aperiodicreporting of channel status information of the relevant downlinkcomponent carriers, the downlink control information indicates an indexand number of the relevant downlink component carriers, wherein themaximum number of resources allocated by the base station to the userequipment is a first number if the user equipment should perform theaperiodic reporting of channel status information of one downlinkcomponent carrier; and the maximum number of the resources allocated bythe base station to the user equipment is a second number if the userequipment should perform the aperiodic reporting of channel statusinformation of more than one downlink component carrier; a transmitterconfigured to aperiodically transmit the channel status informationaccording to the triggering information, wherein the downlink controlinformation further comprises an index of coding and modulation scheme,wherein resources are allocated to the user equipment by the basestation according to the number of the relevant downlink componentcarriers, and wherein the transmitter is configured to perform theaperiodic transmission of channel status information according to thetriggering information, the index of coding and modulation scheme andused resources contained in the downlink control information.
 5. Theuser equipment according to claim 4, wherein the first number is
 4. 6.The user equipment according to claim 4, wherein the second number isgreater than the first number, and the first number and the secondnumber are determined according to a Channel Coding Rate (CCR).
 7. Acommunication system, comprising: a base station which includes acontrol circuit configured to allocate corresponding resources to a userequipment according to a number of relevant downlink component carriersof which the user equipment should perform an aperiodic reporting ofchannel status information; and the user equipment which includes areceiver configured to receive downlink control information transmittedby the base station, the downlink control information comprisingtriggering information which indicates to the user equipment whether toperform the aperiodic reporting of channel status information ofrelevant downlink component carriers and when indicated to perform theaperiodic reporting of channel status information of the relevantdownlink component carriers, the downlink control information indicatesan index and number of the relevant downlink component carriers, and atransmitter configured to perform an aperiodic transmission of channelstatus information according to the triggering information; and thecontrol circuit of the base station is further configured to allocatemaximum resources of a first number to the user equipment if the userequipment should perform the aperiodic reporting of channel statusinformation of one downlink component carrier, and to allocate maximumresources of a second number to the user equipment if the user equipmentshould perform the aperiodic reporting of channel status information ofmore than one downlink component carriers, wherein the downlink controlinformation further comprises an index of coding and modulation scheme,wherein resources are allocated to the user equipment by the basestation according to the number of the relevant downlink componentcarriers, and wherein the transmitter is further configured to performthe aperiodic transmission of channel status information according tothe triggering information, the index of coding and modulation schemeand used resources contained in the downlink control information.
 8. Thesystem according to claim 7, wherein the first number is
 4. 9. Thesystem according to claim 7, wherein the second number is greater thanthe first number, and the first number and the second number aredetermined according to a Channel Coding Rate (CCR).